Silicon Unilateral Switch (SUS)

Discussion in 'Electronics Resources' started by Blizz, Nov 4, 2011.

  1. Blizz

    Thread Starter New Member

    May 17, 2011
    2
    0
    Does anyone have a SPICE model for a Silicon Unilateral Switch (SUS) e.g. 2N4990, 2N4987, or NTE6404.

    I am building a circuit in Multisim and need the component.
    Thanks,
    Blizz
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    I don't have one of a SUS, but here's some stuff that might help you:

    [​IMG]

    Here's a couple of models for PUTs.
    1: Anode
    2: Gate
    3: Cathode

    Code ( (Unknown Language)):
    1. *Default Programable Unijunction Transistor pkg: TO-92
    2. .SUBCKT PUT 1 2 3
    3. Q1 2 4 3 NMOD
    4. Q2 4 2 1 PMOD
    5. .MODEL NMOD NPN()
    6. .MODEL PMOD PNP()
    7. .ENDS XPUT
    8.  
    9. *Programable Unijunction Transistor pkg: TO-226AA
    10. .SUBCKT 2N6027 1 2 3
    11. Q1 2 4 3 NMOD
    12. Q2 4 2 1 PMOD
    13. .MODEL NMOD NPN(IS=5E-15 VAF=100 IKF=0.005 ISE=1.85E-12 NE=1.45
    14. + RB=10 RE=0.5 RC=0.5 CJE=3.5E-11 VJE=0.75 CJC=1.1E-11 VJC=0.75 TR=4.76E-8
    15. + TF=16N VJS=0.75 )
    16. .MODEL PMOD PNP(IS=2E-15 VAF=100 IKF=0.005 ISE=1.9E-12 RB=10 RE=0.5
    17. + RC=0.5 CJE=3.5E-11 VJE=0.75 TF=1.6E-8 CJC=1.1E-11 VJC=0.75 TR=5.1E-8
    18. + TF=16N VJS=0.75 )
    19. .ENDS 2N6027
    And for 7.5v & 8.2v 500mW Zeners:

    Code ( (Unknown Language)):
    1. .MODEL 1N755 D(IS=1E-11 RS=3.359 N=1.27 TT=5E-8 CJO=2.959E-10 VJ=0.75 M=0.33 BV=7.433 IBV=0.01 Vpk=7.5)
    2. .MODEL 1N756 D(IS=1E-11 RS=3.858 N=1.27 TT=5E-8 CJO=2.749E-10 VJ=0.75 M=0.33 BV=8.123 IBV=0.01)
    That should be enough to at least get you started.

    If you want to try to first build one schematically, have a look in our Thyristor section:
    http://www.allaboutcircuits.com/vol_3/chpt_7/8.html

    The 2N6027 is discussed near the bottom of the page.
     
  3. Blizz

    Thread Starter New Member

    May 17, 2011
    2
    0
    Thank you Sgt Wookie
    Blizz
     
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